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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Library/DoubleBuffer.h>
namespace Kernel {
class SlavePTY;
class MasterPTY final : public CharacterDevice {
public:
static ErrorOr<NonnullLockRefPtr<MasterPTY>> try_create(unsigned index);
virtual ~MasterPTY() override;
unsigned index() const { return m_index; }
ErrorOr<size_t> on_slave_write(UserOrKernelBuffer const&, size_t);
bool can_write_from_slave() const;
void notify_slave_closed(Badge<SlavePTY>);
bool is_closed() const { return m_closed; }
virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
private:
explicit MasterPTY(unsigned index, NonnullOwnPtr<DoubleBuffer> buffer);
// ^Device
virtual bool is_openable_by_jailed_processes() const override { return true; }
// ^CharacterDevice
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
virtual bool can_read(OpenFileDescription const&, u64) const override;
virtual bool can_write(OpenFileDescription const&, u64) const override;
virtual ErrorOr<void> close() override;
virtual bool is_master_pty() const override { return true; }
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
virtual StringView class_name() const override { return "MasterPTY"sv; }
LockRefPtr<SlavePTY> m_slave;
unsigned m_index;
bool m_closed { false };
NonnullOwnPtr<DoubleBuffer> m_buffer;
};
}
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